PARIS (AP) — The leaders of France and the U.K. on Friday welcomed the announcement by Iran and the U.S. that the Strait of Hormuz is open, but said freedom of navigation must be permanently restored to the key oil route choked by the U.S.-Israeli war on Iran.

President Emmanuel Macron and Prime Minister Keir Starmer said they would keep planning an international mission to restore maritime security, which Starmer said will be deployed "as soon as conditions allow." They said military planners will meet in London next week.

Speaking after a gathering of some 50 countries, Macron said "we all demand the full, immediate and unconditional reopening of the Strait of Hormuz by all parties."

Starmer said the announcement by Iran and the U.S. that the waterway is open must become "both lasting and a workable proposal."

The Paris meeting is part of attempts by sidelined nations to ease the impact of a conflict they didn't start and haven't joined, but that has sent the global economy reeling. Petroleum prices soared after the war started on Feb. 28, when Iran effectively shut the narrow strait through which a fifth of the world's oil usually passes.

As representatives from about 50 nations and international organizations, including over 30 heads of state and government, joined the meeting in Paris, U.S. President Donald Trump and Iran's foreign minister declared the strait open to commercial vessels. Oil prices plunged after Iranian Foreign Minister Abbas Araghchi posted on X that passage for commercial vessels would remain "completely open" for the duration of a 10-day ceasefire in Lebanon.

Trump in an all-caps social media post said that the U.S. Navy's blockade of Iranian ships and ports would remain in force "UNTIL SUCH TIME AS OUR TRANSACTION WITH IRAN IS 100% COMPLETE."

The U.S. is not part of the planning for what has been branded the Strait of Hormuz Maritime Freedom of Navigation Initiative. In a post on X ahead of Friday's conference, Macron said the mission to provide security for shipping through the strait would be "strictly defensive" and limited to non-belligerent countries.

Keir Starmer, facing political troubles at home, was greeted by Macron in the courtyard of the Elysee presidential palace on Friday afternoon.

German Chancellor Friedrich Merz and Italian Premier Giorgia Meloni also attended in person. Others, including the prime ministers of Australia and Canada and the South Korean and Ukrainian presidents, joined by video.

Macron and Starmer have spearheaded international efforts to increase diplomatic and economic pressure on Iran, which Starmer has accused of "holding the world's economy to ransom."

"The unconditional and immediate reopening of the strait is a global responsibility, and we need to act to get global energy and trade flowing freely again," Starmer said before the meeting.

Military planning underway

France and Britain also have led military planning meetings, in an echo of the "coalition of the willing" assembled to provide security for Ukraine in the event of a ceasefire in that war.

Macron's office said participants will contribute "each according to its capabilities," stressing options to ensure safe passage through the strait will depend on the security situation after a lasting ceasefire.

"What matters is that ship operators have all the means at their disposal to be sure their vessels will not be hit if they pass through the strait. That may require intelligence, mine-clearing capabilities, military escorts, communication procedures with coastal states etc.," an official said, speaking on condition of anonymity in line with the French presidency's customary practices.

Sidharth Kaushal, a research fellow in sea power at the Royal United Services Institute think tank, said mine-clearing and creating a warning system for maritime threats were more likely roles for the coalition than warships escorting commercial tankers through the strait.

"You need huge numbers of vessels for that sort of thing, which nobody has," he said.

Iran expert Ellie Geranmayeh, deputy head of the Middle East and North Africa program at the European Council on Foreign Relations think tank, said mine-clearing is an area where European countries and their partners could play a role.

"They would be a better party to do this than the United States, because once you have U.S. military doing this and lingering on Iranian shores, it creates a potential arena for Iran and the U.S. to have miscalculations and get back into a sort of military tension," she said.

Dozens of countries involved in talks

Britain has discussed using mine-hunting drones, deployed from the ship RFA Lyme Bay, for a Hormuz mission.

The war has highlighted the shrunken state of the Royal Navy, which has deployed just one major warship, the destroyer HMS Dragon, to the eastern Mediterranean. France, which has the EU's most powerful military, has sent its nuclear-powered aircraft carrier to the region, alongside a helicopter carrier and several frigates.

More than 40 nations have taken part in diplomatic or military meetings led by France and the U.K. in recent weeks, though fewer are likely to commit military resources.

The operation is partly a response to Trump, who has berated allies for failing to join the war and said reopening the strait is not America's job. The president has called allies "cowards," said NATO "wasn't there when we needed them" and telling Britain: "You don't even have a navy."

"I imagine there'll be some desire on the part of many European states, and potentially Canada, to demonstrate the ability to provide security in a way that's distinct from, if not completely separate from, the U.S. and which also demonstrates a capacity for independent action," Kaushal said.

"How many states actually have spare capacity to offer to this is a pretty open question."

Lawless reported from London.